Balance



March 16 1926;

P. C. JOUAN BALANCE Filed Feb. '2. 1924 4 Sheets-Sheet i March 16 1926.

- P. c. JOUAN BALANCE Filed 2, 1924 4 Sheets-Shet 2 Hy v March 16 1-926.

- I 1,576;914 P. c. JOUAN BALANCE F iled Feb. 2, 1924 4 Sheets-Sheet sIII P. C. JOUAN March 16 1926.

BALANCE 4 Sheets-Sheet 4 Filed Feb. 2, 1924 7 that theitangent ofthehhgle ofinclination corresponding to .a given weight is prportionateto said weight. The equation (1) may alsojbe:

f r atw v (70 being a constantlf1'Therefore,.:if"the scale E 'isperpendicular to the line which connects the edge of thesuspensionknife,

' to that pointlof thescale which corresponds to the horizontal"position [of the -other v' kn ives; thii' divis-ions of the scale 'willbe equidistant foreven weights.

e drawn the equation j: A

V a This may be attained either by adjusting the centre of gravityof thebalance lever or' 'by adjustingfits weight; :5In carrying lnto efl'ect;the' present invention care should: be

taken to reduce as Ifar; aspossible thefweight Y of y -the balance-leverwhich may he done increasing as, iar'l-fas possible the lengthj Dl' Thishas the adv ntage of reducing vthe inertia "of the system and increasingits sen- *si'tivityyother factors remaining the same.

cross vmembers ib and; carry at the top $1 1 ports, ciof the balancellever. "Between the -Bearing=in mind theadvantages above re- Ife'r'r'edto one constructional form [of the- I invention willi'n'owfbe describedwith ref f- ,erence' to FigsijQ to l-of the accompanying drawings; i a I1 The frame a; ihi aiai c: is a'bns'timaa byl'two cheeks age-which areconnected' by cheeksga l is arranged the 'balance 'flevenial which is orliT shape and-bangle 'section and carries the mainsuspensmnknife 7- andthe 1 end al ot the-"vertical partiof "the balance ""flever d ,lcarriesa regulating'weight d? vwhich serves for adjusting the weight ofthelever -noniusd which projectsfinto the base: .Lof the apparatusbetween two rules g and; 9? arranged in such 'a manner asto form].rectilineal horizontal 's'cales by means of The nonius whic-is'separatelyshown in -Fig. 5 contains a strong -line extending in,"the direction of *thegaxis whichfindicates 1 7 upon the-scale gi'theweightto'be measured .fiin grammes'. Inaddition tothe main line *t'he'nonius contains other: divisions properly which the absolute value ofthe tangent of the 7 angleof inclination of the balance lever andconsequentlyfalso theweight" may be {directlyread at an -time.. 5

"drawn andintended to. indicate decigroup serve'for reading fractions5:01? the to of the scale 9, that is tosay, up to the] vertical axispassing through the knife -other group which may be distinguishedby adili'erent colour,- serve for readingflfrac T cient: accuracy j-answerthe above mentions conditionsfan arm Poi'the lever Z.

50 grammes which causes tlielbalance'lever q cite assume a! position inwl1ich' =t11e middl line of the n-onius' isoppositethe zero or: thescale that is,the-startingpoint of the scale I whenthe scale h is freeofyload. -grammes." As may be seen "trom'Fig. ethe v divisionsof thenonius are arranged in two groups." Thejdlvisions of the r1ght handgramme sp n i to the divisions 0 9 hebalancejwhilst the divisions ofthe" tions) of Q the gramme from- --50 to..I00i grammes. The divisions50 toofthel rule 9''- shouldbe of the same'colour as the] correspondingdivisions l of the nonius.,-' Itthe noniusshould be arranged in suchaintersection of these divisionsandthe edg at any inclination-ofthebalance lever; I i a 7 rule, may be found 'by calculation' that 8 5.

may be use'd in place of the mathematically f The oscil-lations of thescales "h, k and? the h balance lever cl should b e-daniped'in a suitable manner in order a to produce "a; rapi stabilizationot the balance,vForfthis pur pose, the two scales carry each at'iits un de side verticalrod which passes freely through the 'centrali opening oi a light and"freely -=nioi1n tedplate'i which rests unde its Vow n weight upon thehorizontal annula edge. of'a circular support'y' fixedtolthe cheeks, a;The, oscillations"ofi the scales; during each weighing r operationCilIlf take placeronly with a simultaneous movement of the plates c' andare therefore :brakedin the horizontal direction; without inciany wayimpeding the vertical moveinent and re ducing the sensitivity ofthe-balance) Th stabilization of the balancelever v (Z in 'th exactposition correspondingtolg=the weigh to be measured is elieeted bymeansloi" brake member 70 of flexible-material,JfOrIIun' stance, leathercarriedeby' a .pivoted'leverv and provided with finger'key By depressing the key m severalftimesinirapidf; succession a numberofinstantaneousi brakwi ing actions 'of'short duration is produced bywhich the balance :lever is arrested in the required} position. For)adjusting-1 th amount of friction between thepbra ke mem' ber k and "thebalance leverftheregis' pro ided a stopl which limits the" stroke "0 Theupper p a'rt of the: weight 1 prov dedwith" a-weightn ofa'valuegequal toUpon an object'to be weighed being placed 39. i

v1 [of 1 00 grammes; Tonlyg fractions of jLIOO For thisapan:

v pose, "thetscaleih isjprovid d with inclined the' object to be"weighed isagainplaced in upon 4 the h, balaneeglever d oscillates'fxronii infeste -@111; and gis arrested or stabilized by tapping gpbnthe key lm, iA-s soonag the balance; "lever is arrested, the weight E ofthe object "placed in rthe scale may be we directly; upon the scale g1he described ibalianeesl -inay' L- rcading .1 the remainder ,;--that Jis,

shelves "O adapted? ,i-foir inception of I weights .IItlwill beobserved, that allthe weights placedin the rshelves o" Will'jbe di's-'posed exactlyinthevertical axis of the scale V Fo'r weighing weightsabove 100 grammes,

thelsca le h which causes the balance lever to swingagainst thecorresponding stop. A

weighto-frlOO grammes is then placed upon the other scale If. If thisweight does not produceany; effect upon the balance'lever,

a second weight of 100 grammes is inserted and so 'on until the scale itis lifted. If the Mequilibrium is established in such a. position thatthe endd of the vbalance lever 'remams: bet-ween thejlimitsofthe scaleconstituted by the rules g, 9 (high) the operation is completedandgthefweightmay be directly read by reading it on the scale and bycount ing'the weights placed inthe scale 'FOI.

' instance, assuming that the scale 72/ carries .weights'of 100, grammesand 50gra1nmes as 'describediand that the end cl flof the'balance in Iin the scale h will 17 grammes and 7.

lever has been stopped at the division 24 andseven-tenths, the weight,ofj'the object decigramni'e s'.

Figs; 6 to 8- represent amodified form of the invention in which thehollow scales"- 'or pans-are provided with eyes or handlesrestingdirectly upon knives mounted upon the arms Q oft-he balance.lever 7. Each pan rests upon two knives 7, for f f re- 1 spectively; Inthis construction the yveight 2' forbrakingthe scales h,- h ,a-nd thebrake /r: acting upon the balance lever act in exactly the'samemanner asthe previously I described construction. The shaft of the key"han'dleaof thebrake is,

providedwith a ret urnspring. V

Ill-lllB-DODIUS previously described the divisions of the nonius arearranged in two grou'p-s'ofl to 10 arranged onf'opposite sides offthe'axis of thej'nonius each groupservmg .inconnection with thecorresponding half-of the scale. 'Insomeca'ses it is very'rl-hoaveversibe,

utilized fur -weighing object-s of. i weight x-si -byzplacing on the:

g g g 1 strictedatolltheseaparticular forms. Thie scaleg then. serves;

in this case, I I weights corresponding to the inclination of convenientto use a single nonius which may be employed-forthe :whole lengthiofiith e ,airangedwin the man-.

. lIljJWill lbea-iuaderstood that thefdescribedofeXample-and i-thatthe?invention is not i re? :Having. ow -particnlarly described andascertained the nature of. inytsalid invention and in whatmannerithesameis to be=per-- foianeighl declare that 'whatcny .claimis3 1. ianiimproved balance,which co nprises a frame, a scale pan toreceive theobject to be weighed, a weighted balancelever pivoted uponthe frame, said frame having a regt'ilineal' graduated scale along"which the end of the weighted balance lever travels, said lever having a'nonius at its freeend,

j and another scale pan adapted to receive welghts corresponding to themaximum of the graduated .scale'or multiples thereof.

2. 'An improved balance, which comprises a'frame, a scale panadapted toreceive the object tobe weighed, a weighted balance lever pivoting uponthe frame, said frame having a rectilineal graduated I scale along whichthe end of the weighted balance lever can travel and said scale havingequidistant forms bfseonstnuctioniare given-only way" divisions for evenweights, said lever hav ing an index mark anda nonius at the freeendthereof, and another scale pan adapted to receive weightscorresponding vto the maximum of the graduated scale or multi-. -plesthereof. V V

3. An improved balance, which comprises" l a frame, a scale pan toreceive the object .to be weighed, a weighted balance leverpivoted uponthe frame, said frame'having arectilineal graduated scale along whichthe end of the weighted balance leverlcan travel, said lever havinganonlus at the free end of the same, another scale pan adaptedto receiveWeights corresponding to the 1naxi- [mum of the graduated scale ormultiples 7 thereof, vertical members carried by the two scale pans, andfreely mounted horizontallyarranged plates through which the saidvertical members run freely.

4. An improved balance, which comprises a frame, a scale pan toreceivethe ob ect to be weighed, a weighted balance lever pivoted'upon thefra1ne,said frame having two rectilineal graduated scales between whichthe end of'theweighted balance lever can 0s cillate thus allowing thereading of the the balance lever to be made from either side oftheapparatus, said leverdhaving a "j5.-'Anizimproved :fbalancey Which"c0m.

n i'ses a frame, a scale'pan adapted to receive theobject to be Weighed,a Weighted balance 'lever pivoted-V upon the frame, said frame having, a--rectil ineal "graduated scale falongwhich the end oftheweightedbalance Y levercanreciprocate, said*lever'-=having a '1inoniusmat ite fre'e wend;a brakirlg board I scale or' multiplesthereof.

adapted'to act upon-Y thebalanceilevefl a key toj'actuate said-brakingboard, and another scale pan adapted to receiveeights corre'SPOIldlIlgtO the maxlmum of the graduated .-.6. An improved; balance,whlchl comprises fa .frame, fa scale pan a daptedito "receive the 'forany inclinationo'f the halance lever, and: another scale pan adapted ,tojrecelvewelghts i my invention, I hav e;signed" my namef'j correspondingto V the makimnmf of the grad-V uated scale or multiplesthereof.

In testimonythat I claim the foregolng as

